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 Manual Interlocking When members of the train crew are the ones who have to throw the switches. An example of this is a section of track where the SRY crosses over the CP mainline. The interlocking is always defaulted to give the CP the right-of-way (CP was there first). When the SRY wants to get through, a member of the crew has to actually get off the train and get into a little hut where he throws a switch that allows the SRY train to get through the interlocking, this also gives the CP mainline a stop signal to ensure that no CP trains will come bareling through. (Two signals actually, a Clear to Stop about a mile away, then a Stop signal just before the interlocking.) When the entire SRY train has passed through the interlocking, the SRY crew memeber then has to throw the switch back to give the CP the right-of-way-again. Automatic Interlocking The same as Mark described, it's a first come first serve basis, nobody gets out of the train, it's just all controlled by interlocking signals. There are a few of these around here, namely where the CP crosses the CN in Mission. Then we have two kinds of controlled interlockings... Remotely Controlled Interlocking This is where two railways cross, and you have to contact the RTC to get a signal. We have one of these where the BNSF crosses over the BC Rail Port Subdivision. All trains traveling on the Port Subdivision have the right-of-way, and if the BNSF wants to get through, they have to call up the port sub RTC to get a signal to cross over. Locally Controlled Interlocking These are the interlockings where there is someone on site that controls the signals and interlocking, instead of someone sitting in an office 50 miles or more away. We have a number of these interlockings, though they are all bridges that have bridge tenders. Each one is a little different, but generally if you don't have a signal to enter the interlocking you call up the tender to see what's happening. I know that's not a railway crossing kind of interlocking, but they're still considered interlockings in this part of the woods..... instead of another railway, you're competing with boats for access.
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